{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:HFKRHPEDX252O33XVA54L3QI4Q","short_pith_number":"pith:HFKRHPED","canonical_record":{"source":{"id":"2103.03295","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2021-03-04T20:08:05Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"aed91b6dd7803e2544817ad616e8a37e06f87139f9e7e3a1497b7317639620ab","abstract_canon_sha256":"00b4da2adee7abc27d3fc4fc6949ee1cc8429890da56e5ecefd7816943e8ccbb"},"schema_version":"1.0"},"canonical_sha256":"395513bc83bebba76f77a83bc5ee08e429b2f1c2bb8bc216c8040f1c121d77ec","source":{"kind":"arxiv","id":"2103.03295","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2103.03295","created_at":"2026-07-05T02:23:28Z"},{"alias_kind":"arxiv_version","alias_value":"2103.03295v1","created_at":"2026-07-05T02:23:28Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2103.03295","created_at":"2026-07-05T02:23:28Z"},{"alias_kind":"pith_short_12","alias_value":"HFKRHPEDX252","created_at":"2026-07-05T02:23:28Z"},{"alias_kind":"pith_short_16","alias_value":"HFKRHPEDX252O33X","created_at":"2026-07-05T02:23:28Z"},{"alias_kind":"pith_short_8","alias_value":"HFKRHPED","created_at":"2026-07-05T02:23:28Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:HFKRHPEDX252O33XVA54L3QI4Q","target":"record","payload":{"canonical_record":{"source":{"id":"2103.03295","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2021-03-04T20:08:05Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"aed91b6dd7803e2544817ad616e8a37e06f87139f9e7e3a1497b7317639620ab","abstract_canon_sha256":"00b4da2adee7abc27d3fc4fc6949ee1cc8429890da56e5ecefd7816943e8ccbb"},"schema_version":"1.0"},"canonical_sha256":"395513bc83bebba76f77a83bc5ee08e429b2f1c2bb8bc216c8040f1c121d77ec","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:23:28.648521Z","signature_b64":"dJDRj+pNzEy2vsHRm1w2BOIxDgmoTvtBnfAxZjqZ2TvwZmORWwYNupl43gGUaTQQZavk04qqDxxZkmVL9gIJBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"395513bc83bebba76f77a83bc5ee08e429b2f1c2bb8bc216c8040f1c121d77ec","last_reissued_at":"2026-07-05T02:23:28.648160Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:23:28.648160Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2103.03295","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T02:23:28Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"N8AnsD5m+s/pI+hI5vs/bhbCEwLx5u78H56IWOaXAH9TSGsNt4XM5zNVkXJC6178pjKQgeidc7gj5/oWDgh2Dg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-20T14:19:04.551873Z"},"content_sha256":"09a91a710b64779280f74d7e0c84fb0f72fb7866091ea06c1a4b94a54e2cdedd","schema_version":"1.0","event_id":"sha256:09a91a710b64779280f74d7e0c84fb0f72fb7866091ea06c1a4b94a54e2cdedd"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:HFKRHPEDX252O33XVA54L3QI4Q","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The discovery of a highly accreting, radio-loud quasar at z=6.82","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.CO","authors_text":"Aaron J. Barth, Anna-Christina Eilers, Antonio Pensabene, Bram P. Venemans, Chiara Mazzucchelli, Chris Carilli, Daniel Stern, Eduardo Banados, Emanuele Paolo Farina, Emmanuel Momjian, Feige Wang, Frederick B. Davies, Irham Taufik Andika, Jan-Torge Schindler, Jinyi Yang, Joseph F. Hennawi, Lukas Wenzl, Roberto Decarli, Thomas Connor, Xiaohui Fan","submitted_at":"2021-03-04T20:08:05Z","abstract_excerpt":"Radio sources at the highest redshifts can provide unique information on the first massive galaxies and black holes, the densest primordial environments, and the epoch of reionization. The number of astronomical objects identified at z>6 has increased dramatically over the last few years, but previously only three radio-loud (R2500>10) sources had been reported at z>6, with the most distant being a quasar at z=6.18. Here we present the discovery and characterization of P172+18, a radio-loud quasar at z=6.823. This source has an MgII-based black hole mass of ~3x10^8 Msun and is one of the faste"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2103.03295","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2103.03295/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T02:23:28Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bM1V686bCvp6otKUwrQLKKEkbi8Nub8nszbbgRBFwkPD4+HiAyWNdmgh2Zxq5W1D8m76QEM0ClTjmP5RixpMDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-20T14:19:04.552241Z"},"content_sha256":"e31f4c20182db021ffe6ad5e015b5117fba65f2d8701e278c2e037bf81805707","schema_version":"1.0","event_id":"sha256:e31f4c20182db021ffe6ad5e015b5117fba65f2d8701e278c2e037bf81805707"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/HFKRHPEDX252O33XVA54L3QI4Q/bundle.json","state_url":"https://pith.science/pith/HFKRHPEDX252O33XVA54L3QI4Q/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/HFKRHPEDX252O33XVA54L3QI4Q/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-08-20T14:19:04Z","links":{"resolver":"https://pith.science/pith/HFKRHPEDX252O33XVA54L3QI4Q","bundle":"https://pith.science/pith/HFKRHPEDX252O33XVA54L3QI4Q/bundle.json","state":"https://pith.science/pith/HFKRHPEDX252O33XVA54L3QI4Q/state.json","well_known_bundle":"https://pith.science/.well-known/pith/HFKRHPEDX252O33XVA54L3QI4Q/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:HFKRHPEDX252O33XVA54L3QI4Q","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"00b4da2adee7abc27d3fc4fc6949ee1cc8429890da56e5ecefd7816943e8ccbb","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2021-03-04T20:08:05Z","title_canon_sha256":"aed91b6dd7803e2544817ad616e8a37e06f87139f9e7e3a1497b7317639620ab"},"schema_version":"1.0","source":{"id":"2103.03295","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2103.03295","created_at":"2026-07-05T02:23:28Z"},{"alias_kind":"arxiv_version","alias_value":"2103.03295v1","created_at":"2026-07-05T02:23:28Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2103.03295","created_at":"2026-07-05T02:23:28Z"},{"alias_kind":"pith_short_12","alias_value":"HFKRHPEDX252","created_at":"2026-07-05T02:23:28Z"},{"alias_kind":"pith_short_16","alias_value":"HFKRHPEDX252O33X","created_at":"2026-07-05T02:23:28Z"},{"alias_kind":"pith_short_8","alias_value":"HFKRHPED","created_at":"2026-07-05T02:23:28Z"}],"graph_snapshots":[{"event_id":"sha256:e31f4c20182db021ffe6ad5e015b5117fba65f2d8701e278c2e037bf81805707","target":"graph","created_at":"2026-07-05T02:23:28Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2103.03295/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Radio sources at the highest redshifts can provide unique information on the first massive galaxies and black holes, the densest primordial environments, and the epoch of reionization. The number of astronomical objects identified at z>6 has increased dramatically over the last few years, but previously only three radio-loud (R2500>10) sources had been reported at z>6, with the most distant being a quasar at z=6.18. Here we present the discovery and characterization of P172+18, a radio-loud quasar at z=6.823. This source has an MgII-based black hole mass of ~3x10^8 Msun and is one of the faste","authors_text":"Aaron J. Barth, Anna-Christina Eilers, Antonio Pensabene, Bram P. Venemans, Chiara Mazzucchelli, Chris Carilli, Daniel Stern, Eduardo Banados, Emanuele Paolo Farina, Emmanuel Momjian, Feige Wang, Frederick B. Davies, Irham Taufik Andika, Jan-Torge Schindler, Jinyi Yang, Joseph F. Hennawi, Lukas Wenzl, Roberto Decarli, Thomas Connor, Xiaohui Fan","cross_cats":["astro-ph.GA"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2021-03-04T20:08:05Z","title":"The discovery of a highly accreting, radio-loud quasar at z=6.82"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2103.03295","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:09a91a710b64779280f74d7e0c84fb0f72fb7866091ea06c1a4b94a54e2cdedd","target":"record","created_at":"2026-07-05T02:23:28Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"00b4da2adee7abc27d3fc4fc6949ee1cc8429890da56e5ecefd7816943e8ccbb","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2021-03-04T20:08:05Z","title_canon_sha256":"aed91b6dd7803e2544817ad616e8a37e06f87139f9e7e3a1497b7317639620ab"},"schema_version":"1.0","source":{"id":"2103.03295","kind":"arxiv","version":1}},"canonical_sha256":"395513bc83bebba76f77a83bc5ee08e429b2f1c2bb8bc216c8040f1c121d77ec","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"395513bc83bebba76f77a83bc5ee08e429b2f1c2bb8bc216c8040f1c121d77ec","first_computed_at":"2026-07-05T02:23:28.648160Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:23:28.648160Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"dJDRj+pNzEy2vsHRm1w2BOIxDgmoTvtBnfAxZjqZ2TvwZmORWwYNupl43gGUaTQQZavk04qqDxxZkmVL9gIJBw==","signature_status":"signed_v1","signed_at":"2026-07-05T02:23:28.648521Z","signed_message":"canonical_sha256_bytes"},"source_id":"2103.03295","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:09a91a710b64779280f74d7e0c84fb0f72fb7866091ea06c1a4b94a54e2cdedd","sha256:e31f4c20182db021ffe6ad5e015b5117fba65f2d8701e278c2e037bf81805707"],"state_sha256":"69af3aa8db663289e2089915e4ca4cbf53da81ac61a7f9267ec4a6399e6cc796"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bB3gBR1i0KiZlFuI8wRzI0RLHQcMhcY3E/9pLDm/TndSjshc8Dphs3NKY1L3wl5dHS8Q/wHDYLPTeJsU0Eb4Ag==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-20T14:19:04.555663Z","bundle_sha256":"1bad7269f763b926b4b2f6e2992ee0c0cd129e1cc1e11d992be70570bb5516f8"}}